二氧化氯杀菌剂配伍羧酸水处理剂的缓蚀性能

Corrosion Inhibition of Chlorine Dioxide with Carboxylic Acid Water Treatment Agents

投加二氧化氯可以有效地控制冷却水中的微生物。采用旋转挂片腐蚀试验和电化学试验研究了二氧化氯对金属的腐蚀问题,并研究了二氧化氯溶液中配伍羧酸类水处理剂PBTCA(2-膦酸基丁烷-1,2,4-三羧酸)、PESA(聚环氧琥珀酸)、TH-628(有机羧酸复合药剂)的缓蚀性能。结果表明,二氧化氯浓度为0.8mg/L时,碳钢的腐蚀率最低。三种药剂在二氧化氯的体系中均有一定的缓蚀作用,PESA的缓蚀效果最好。在碳钢的腐蚀过程中,复合药剂TH-628对电极的阳极和阴极过程均具有抑制作用,属于混合型缓蚀剂。

Microorganisms in circulating cooling water can be effectively controlled by injecting chlorine dioxide. The metal corrosion due to chlorine dioxide and the corrosion inhibition property of PBTCA （2-phosphonobutane-1, 2, 4- tricarboxylic acid）, PESA （polyepoxysuccinic acid） and TH-628（organic carboxylic acid complex reagent） in chlorine dioxide solution were investigated by rotary weight-loss measurement and electrochemical testing. The results indicated that the concentration of 0. 8 mg/L chlorine dioxide resulted in the lowest corrosive rate of carbon steel. Complex drugs TH-628, PBTCA and PESA had good inhibition effects. In the process of corrosion of carbon steel, complex reagent TH-628 has inhibition effect on the reactions of both anode and cathode. So it is a mixed inhibitor.